<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.d1 {
				width: 200px;
				height: 200px;
				background-color: #00FFFF;
				position: absolute;
				/* left: calc(50% - 100px);
				top: calc(50% - 100px); */
				left: 50%;
				top: 50%;
				transform: translate(-50%, -50%);
			}
		</style>
	</head>
	<body>
		<div class="d1">
			
		</div>
	</body>
</html>
